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D( x )
(1/7)*x^6 <= 0
(1/7)*x^6 <= 0
(1/7)*x^6 <= 0
1/7*x^6 <= 0
1/7*x^6 <= 0 // : 1/7
x^6 <= 0/1/7
x^6 <= 0
x in <0:0>
x in (-oo:0) U (0:+oo)
ln((1/7)*x^6) = 0
ln((1/7)*x^6) = ln(e^0)
(1/7)*x^6 = e^0
(1/7)*x^6-e^0 = 0
1/7*x^6 = 1 // : 1/7
x^6 = 7
x^6 = 7 // ^ 1/6
abs(x) = 7^(1/6)
x = 7^(1/6) or x = -7^(1/6)
x in { 7^(1/6), -7^(1/6) }
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